The Andromeda Strain

The correct antibody is available but never tried. Dr. Ruth Leavitt (Kate Reid) suffers a mild epileptic seizure when she sees the red letters indicating the correct antibody, and lets it slip by without realizing it. After the team discovers that the strain only infects people without pH problems in their blood, the disease mutates. The new strain is harmless to humans, but decomposes the artificial plastic seals used in Wildfire's insulation. The base detects these breaches and prepares to set off its nuclear self-destruct device. They deactivate it with seconds to spare, preventing the disease from multiplying and mutating endlessly. The remaining cloud of Andromeda still floating around the planet is destroyed by seeding clouds and making acid rain.
Thanks, Robotdoll!